This Ritebar ergonomic roll bar mouse sits in front of your keyboard and promotes a more natural arm position, with no need for reaching or gripping a standard mouse at the side of your keyboard. The roll bar mouse has 5 function buttons, including double click and copy/paste, as well as 3 precision settings (750, 1000 or 1500dpi) for a cursor speed that suits you. This black roll bar mouse also features built-in wrist rests for comfort.